Daily averages (per person, AUD): hostels $35-60, mid-range hotels $180-280, restaurant main $25-40, beer $11-14, supermarket lunch $12-18, public transport day pass $10-12.
Save money: travel in shoulder season (Mar-May, Sep-Nov), book domestic flights with Jetstar or Virgin Australia, eat the AUD $20 lunch specials at pubs, and use BIG4 caravan parks if you have your own vehicle.
Splurge zones: Great Barrier Reef pontoon day trips (AUD $250-350), Uluru sunset dinners (AUD $300+), and Tasmanian fine dining are worth the cost.